Table 4.

MAE_fit and ${\sigma }_{fit}$ values for fitting the mean reference-CT numbers with equation (1) for the overall patient volume and for each segmented region of each LOOCV cycle and their average values for all six cycles.

	MAEfit (HU)			${\sigma }_{fit}$ (HU)
	Bony Region	Soft Region	Mixed Region	Bony Region	Soft Region	Mixed Region
Cycle1	10.4	2.0	16.6	21.5	5.3	31.6
Cycle2	11.0	2.1	17.3	22.6	4.5	33.3
Cycle3	10.4	2.1	16.0	20.0	5.4	31.3
Cycle4	10.5	2.1	15.8	21.4	5.5	29.8
Cycle5	11.3	2.1	16.5	23.2	5.7	32.4
Cycle6	10.9	2.1	15.9	23.3	5.4	31.7
Average	10.8 ± 0.4	2.1 ± 0.0	16.3 ± 0.6	22.0 ± 1.3	5.3 ± 0.4	31.7 ± 1.2